Investigation of the Wear Resistance Properties of Cr/CrN Multilayer Coatings against Sand Erosion
Investigation of the Wear Resistance Properties of Cr/CrN Multilayer Coatings against Sand Erosion
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DOI：
10.1155/2015/873543
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
M. Naveed;A. Obrosov;S. Weiss
中科院分区：
文献类型：
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作者：
M. Naveed;A. Obrosov;S. Weiss
燃气轮机和蒸汽轮机中使用的金属部件由于侵蚀性砂粒的磨损导致其使用寿命大大降低。这种磨损可以通过使用合适的耐腐蚀涂层来减少，从而降低维护成本。在这种情况下，多层Cr/CrN PVD涂层使用工业涂层机设计和应用在Inconel 718，一种材料，发现其在燃气轮机的应用。双峰周期的变化已被诱导，以实现最佳的涂层结构，提供耐腐蚀涂层所需的最佳性能。在氮化阶段，在480-500°C的温度下，使用单一Cr靶并在N2的诱导下沉积涂层，并且始终保持24-26 μm的涂层厚度恒定。侵蚀试验在30°、60°和90°的角度下进行。用于测试的砂是不规则形状的SiO2。腐蚀试验之后，结合纳米压痕和划痕试验，对腐蚀涂层结构进行详细的显微镜检查。
The wear of metallic components used in gas and steam turbines due to erosive sand particles leads to a tremendous decrease in their lifetime. This wear can be reduced by the use of suitable erosion resistant coatings resulting in lower maintenance costs. In this context, multilayer Cr/CrN PVD coatings using an industrial coater were designed and applied on Inconel 718, a material which finds its application in gas turbines. A variation in the bimodal period has been induced in order to achieve an optimal coating architecture providing optimum properties needed for the erosion resistant coatings. The coating was deposited using a single Cr-target with an induction of N2 during the nitriding phase at a temperature of 480–500°C and the coating thickness of 24–26 μm was kept constant throughout. The erosion tests were conducted at angles of 30°, 60°, and 90°. The sand used for the test is an irregular shaped SiO2. The erosion tests were followed by a detailed microscopic examination of the eroded coating structure in combination with nanoindentation and scratch tests.